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Why won't my pto engage?

When I pull the pto switch it want start the pto clutch.I have changed the pto switch and the clutch does click.But it want engage.Does any one have any idea what I need to do next?

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They are normally electro magnetic clutches, the click is the cluch engaging so i would guess it is working, arev you sure the belt is not broken or lose?

Posted on Feb 13, 2012


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Try spraying carb cleaner in pto and use compress air to blow out all dust from pto and then start and see if pto starts engaging.------ But if that is not helping then its quire possible then wiring to the pto clutch is got worn or shorted.------- You need to look at the wiring harness or "pigtail" that powers the electric PTO clutch (in the area of the clutch). Since you said "seem to be drawing current from the battery" I think the wiring to the PTO clutch may have gotten hit by the broken belt and damaged to the point that a portion of the "hot lead" is shorting to ground (bare part of hot wire is touching metal frame or other "grounded" part of tractor. If the belt did not "rip" the wiring out of the electric clutch completely, it may have stretched it enough to strip the wire insulation away INSIDE the clutch assembly. If that be the are likely going to need a new clutch assembly. If, however, you find that a bare wire OUTSIDE the clutch is the can fix that. You can solder and tape it or you can use crimp type "**** splices" to repair the damaged spot. If you find a bare place in the wiring, examine it closely to see if any of the individual "fibers" or strands of wire have been severed. If any have been cut, you need to snip that section out before soldering or "**** splicing". ------- Try engageing the clutch with the engine off and key on. sit on the tractor so you saftey switches are closed. You will HEAR the clutch engage if it is working. If not then check wires as mentioned above. If you look and look and can not find bad wires then disconnect plug to clutch and test wires with volt meter for 12V. If no juice trace back to find prob. If you do have 12v pull clutch and inspect on work bench, you can jump it and see if it engages too. ------- For pto switch wiring diagram, click this link below:---- ---------- This will help.Thanks.Helpmech.

Posted on Aug 27, 2011

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"I have an Electric Clutch and my Blades will not engage when I operate the PTO switch."
  • Turn the engine off and remove the key.
  • Check for physical damage; anything look bent?
  • Is the deck belt intact?
  • Spin the pulley on the bottom of the clutch. Does it spin freely?
  • There could be mud or grit stuck in the clutch.
  • There is a drive key between the clutch and the shaft. Has this key been sheared?
  • When you pull the PTO switch does the clutch make a "click"?
When you sit in the seat and turn the key, one click from off to run, you will hear a faint click. That faint click is the fuel shut off valve under the carburetor. It is turning on and off when you cycle the key from off to run. Do not confuse this click with the clutch click.

Leave the Key in the Run position, cycle your PTO Switch on and off. You will hear a click. This click will be twice as loud as the fuel switch click. This louder click is the Clutch engaging. If you do not hear this click, the PTO switch may be bad or the Clutch may be bad. This is assuming your battery is good and fully charged and that your Key Switch is functioning correctly.

PTO Clutch will Not engage or stay engaged.
There is a very fine discussion on evaluating electric clutches at this site:

My JD tech manual, which covers the entire LA 100 series, agrees with the electrical specifications. It states that the Electric PTO Clutch should show the following:
  • Resistance 3.7 ohms
  • Current Draw 3.25 amps.
  • It does not give the air gap.
It does include a note to check the PTO Clutch Key for damage or if missing. So there is a drive key between the PTO Clutch and the shaft. Additionally, it recommends checking the tightness of the cap screw. That's the screw or bolt that holds the clutch on the shaft.
  • Cap Screw torque 55 lb-ft (75 N.m).

Fixing Electric Clutches

Apr 17, 2015 | Allis Chalmers AC130 46" 23HP All Wheel...

1 Answer

Why does electric clutch click and seems to be getting no spark

While sitting in the seat with the ignition key on you should be able to hear a click from the pto clutch when the pto switch is activated but this click is audibly different from the click of the starter solenoid. The starter will be disabled if the pto switch is on. If you hear the pto clicking while trying to start then there is a failure in the pto switch. If the starter solenoid was bad the starter would not engage. Check ignition switch, pto switch, and look for wires melted together. Also be sure grounds are good. PTO clicking on start and no spark could have a relation with the pto ground and engine kill wire.

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1 Answer

Working on a cub cadet zero turn electric pto to blades, pto won't engage when pulling switch, can't find out why can get it to run jumping straight to battery if I put a toggle on this set up is...

go to and they should have wiring diagrams for your mower, should be a switch or something if the clutch works when you hook it to a battery (seat switch, pto switch, parking brake switch, even the neutral safety switches) also check your ground hook ups

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1 Answer

I have a ferris zero turn mower and it starts and runs fine but the mower blades won't engage, when I lift the knob nothing happens, belt is on - I think something might be unhooked???

first turn the key switch to the on position but dont crank it leave it on then pull out on the pto switch you should be hearing a clicking sound if not keep pulling in and out if you still dont hear it, take the switch it self out of the dash and wiggle the wireing harness pluged in to the switch while pulling in and out on it, if that still dosnt work go buy a new one and hope to god thats your problem because if your pto clutch is bad then thats about 300 to 400 dollars right there so go the cheapest route and change your switch but do the tricks i told you and hope for the best, i hope this helps thaks, jamie

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1 Answer

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check for power to the clutch if yes the clutch could be bad or a wire going to it if no power check the safety switches

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the circuit also goes to the trans so you can't mow in rev also on the brake/clutch pedal switch assuming you check the fuse already

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should go from the switch to the safety switches to the clutch

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